Фото: David Mdzinarishvili / Reuters
Фото: Jamal Awad / Reuters
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（六）放射性同位素，是指化学元素中具有相同原子序数，但质量不同且能发生放射性衰变的核素。
"Using firm contracts in uncertain situations carries significant commercial risks," says Albert Sanchez-Graells, a professor at the University of Bristol Law School who has been researching NHS contracts for more than 15 years.
Samsung has also upgraded image processing on its front-facing cameras with a new Object Aware Engine for improved portrait mode shots, hair textures and more accurate skin tones. Based on my early testing, images seemed sharper than on my older Samsung devices, even though this is (again) largely the same 12MP camera as last year.